linux-kernel - DISCONTIGMEM is deprecated

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Message-ID: <20190419140521.GI7751@bombadil.infradead.org>
Date:   Fri, 19 Apr 2019 07:05:21 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        linux-parisc@...r.kernel.org, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org
Subject: DISCONTIGMEM is deprecated

On Fri, Apr 19, 2019 at 10:43:35AM +0100, Mel Gorman wrote:
> DISCONTIG is essentially deprecated and even parisc plans to move to
> SPARSEMEM so there is no need to be fancy, this patch simply disables
> watermark boosting by default on DISCONTIGMEM.

I don't think parisc is the only arch which uses DISCONTIGMEM for !NUMA
scenarios.  Grepping the arch/ directories shows:

alpha (does support NUMA, but also non-NUMA DISCONTIGMEM)
arc (for supporting more than 1GB of memory)
ia64 (looks complicated ...)
m68k (for multiple chunks of memory)
mips (does support NUMA but also non-NUMA)
parisc (both NUMA and non-NUMA)

I'm not sure that these architecture maintainers even know that DISCONTIGMEM
is deprecated.  Adding linux-arch to the cc.